Update docs

Use nicer youtube video previews.
Add Robocamp 2026 section.

docs/troubleshooting.md

@@ -28,7 +28,7 @@ Do the following:
 * **Calibrate the accelerometer.** if is wasn't done before. Type `ca` command in Serial Monitor and follow the instructions.
 * **Check the attitude estimation**. Connect to the drone using QGroundControl. Rotate the drone in different orientations and check if the attitude estimation is shown exactly as on the video below:
 
-  <a href="https://youtu.be/yVRN23-GISU"><img width=200 src="https://i3.ytimg.com/vi/yVRN23-GISU/maxresdefault.jpg"></a>
+  <a href="https://youtu.be/yVRN23-GISU"><img width=200 src="https://quadcopter.dev/video/yVRN23-GISU.svg"></a>
 
 * **Check the IMU output**. Connect to the drone using QGroundControl on your computer. Go to the *Analyze* tab, *MAVLINK Inspector*. Plot the data from the `SCALED_IMU` message. The gyroscope and accelerometer data should change according to the drone movement.
 * **Check the motors type**. Motors with exact 3.7V voltage are needed, not ranged working voltage (3.7V — 6V).

docs/usage.md

@@ -210,7 +210,7 @@ After this setup, you should see the battery voltage in QGroundControl top panel
 
 2. Check the attitude estimation: connect to the drone using QGroundControl, rotate the drone in different orientations and check if the attitude estimation shown in QGroundControl is correct. Compare your attitude indicator (in the *large vertical* mode) to the video:
 
-   <a href="https://youtu.be/yVRN23-GISU"><img width=300 src="https://i3.ytimg.com/vi/yVRN23-GISU/maxresdefault.jpg"></a>
+   <a href="https://youtu.be/yVRN23-GISU"><img width=300 src="https://quadcopter.dev/video/yVRN23-GISU.svg"></a>
 
 3. Perform motor tests. Use the following commands **— remove the propellers before running the tests!**
 

docs/user.md

@@ -2,6 +2,22 @@
 
 This page contains user-built drones based on the Flix project. Publish your projects into the official Telegram-chat: [@opensourcequadcopterchat](https://t.me/opensourcequadcopterchat) or send materials as a pull request.
 
+## RoboCamp 2026
+
+<p align=center>
+	<a href="https://quadcopter.dev/img/user/robocamp2026/1.jpg"><img height=200 src="https://quadcopter.dev/img/user/robocamp2026/1.preview.jpg"></a> <a href="https://quadcopter.dev/img/user/robocamp2026/2.jpg"><img height=200 src="https://quadcopter.dev/img/user/robocamp2026/2.preview.jpg"></a> <a href="https://quadcopter.dev/img/user/robocamp2026/3.jpg"><img height=200 src="https://quadcopter.dev/img/user/robocamp2026/3.preview.jpg"></a>
+</p>
+
+The second Flix RoboCamp event took place in July 2026 in Saint Petersburg. The main goal for the competitors was to build a Flix-based quadcopter and implement **autonomous position control** using distance sensors and an overhead camera. Several participants were able to implement altitude hold, and two participants implemented stable position hold.
+
+### Highlights
+
+The winning project performed an automatic takeoff, stable position hold (2 min+), and navigation to a point selected by the user by clicking on the camera image.
+
+See the demonstration video:
+
+<a href="https://youtu.be/369Xowm4HcU"><img width=300 src="https://quadcopter.dev/video/369Xowm4HcU.svg"></a>
+
 ---
 
 Author: [Oleg1405](https://t.me/Oleg1405).<br>
@@ -41,7 +57,7 @@ Repository with all the code and PCB sources: https://github.com/Frapais/Sprig-D
 
 Detailed video about making the drone:
 
-<a href="https://youtu.be/82Q-uBq6s48"><img width=400 src="https://i3.ytimg.com/vi/82Q-uBq6s48/maxresdefault.jpg"></a>
+<a href="https://youtu.be/82Q-uBq6s48"><img width=400 src="https://quadcopter.dev/video/82Q-uBq6s48.svg"></a>
 
 ---
 
@@ -173,7 +189,7 @@ RoboCamp took place in July 2025, Saint Petersburg, where 9 participants designe
 
 See the detailed video about the event:
 
-<a href="https://youtu.be/Wd3yaorjTx0"><img width=500 src="https://img.youtube.com/vi/Wd3yaorjTx0/sddefault.jpg"></a>
+<a href="https://youtu.be/Wd3yaorjTx0"><img width=500 src="https://quadcopter.dev/video/Wd3yaorjTx0.sd.svg"></a>
 
 Built drones: